LiftMaster 8550 8550 Manual - Page 17

Install the Protector System® Introduction Be sure power is NOT connected to the garage door opener BEFORE installing the safety reversing sensor. To prevent SERIOUS INJURY or DEATH from closing garage door: • Correctly connect and align the safety reversing sensor. This required safety device MUST NOT be disabled. • Install the safety reversing sensor so beam is NO HIGHER than 6" (15 cm) above garage floor. IMPORTANT INFORMATION ABOUT THE SAFETY REVERSING SENSORS The safety reversing sensors must be connected and aligned correctly before the garage door opener will move in the down direction. The sending sensor (with an amber LED) transmits an invisible light beam to the receiving sensor (with a green LED). If an obstruction breaks the light beam while the door is closing, the door will stop and reverse to the full open position, and the garage door opener lights will flash 10 times. NOTE: For energy efficiency the garage door opener will enter sleep mode when the door is fully closed. The sleep mode shuts the garage door opener down until activated. The sleep mode is sequenced with the garage door opener light bulb; as the light bulb turns off the sensor LEDs will turn off and whenever the garage door opener lights turn on the sensor LEDs will light. The garage door opener will not go into the sleep mode until the garage door opener has completed 5 cycles upon power up. When installing the safety reversing sensors check the following: • Sensors are installed inside the garage, one on either side of the door. • Sensors are facing each other with the lenses aligned and the receiving sensor lens does not receive direct sunlight. • Sensors are no more than 6 inches (15 cm) above the floor and the light beam is unobstructed. Safety Reversing Sensor 6" (15 cm) max. above floor Invisible Light Beam Protection Area 17 Safety Reversing Sensor 6" (15 cm) max. above floor